The rank of the matrix \[\left[ \begin{matrix} -1 & 2 & 5 \\ 2 & -4 & a-4 \\ 1 & -2 & a+1 \\ \end{matrix} \right]\] is

The rank of the matrix \[\left[ \begin{matrix} -1 & 2 & 5 \\

1.	The rank of the matrix \[\left[ \begin{matrix} -1 & 2 & 5 \\ 2 & -4 & a-4 \\ 1 & -2 & a+1 \\ \end{matrix} \right]\] is
A.	1 if \[a=6\]
B.	2 if \[a=1\]
C.	3 if \[a=2\]
D.	1 if\[a=4\]
Answer» C. 3 if \[a=2\]

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The rank of the matrix \[\left[ \begin{matrix} -1 & 2 & 5 \\ 2 & -4 & a-4 \\ 1 & -2 & a+1 \\ \end{matrix} \right]\] is

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